Hi, I am having issues with my hot process soap in a pvc round mold. Near the top, the soap shrinks and is not round whrn I pull I t out . Usually the top 3" or 4" only. I line with parchment paper. I am sorry, I do not have a photo. Was wondering if it's the parchment paper or cooling too quickly? I cool at room temperature. The soap turns out nice, but I am having to re batch the top section or use it only for my use. Thanks! Cheryl